var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
//使用ejs模板
var ejsMate = require('ejs-mate');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
// 调用设置ejs-Mate，才可以用layout语法
app.engine('.html', ejsMate);
app.set('view engine', 'html');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public'),{maxAge:0})); //开发模式设置缓存时间
app.use(express.static(path.join(__dirname, 'dist')));
app.use(express.static(path.join(__dirname, 'node_modules')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

app.locals.linkPath = '/public';
app.locals.altText = '驻美,优雅美学';
app.locals.lazySrc = ''

if(process.env.NODE_ENV === 'development'){
  app.locals.linkPath = '';
}

app.get('*', function(req, res){
    res.render('404', {
        title: 'No Found'
    })
});

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
